COMPAT: 32bit compat on indexing for MI.remove_unused_levels (#15948)

jreback · web-flow · commit 84de51c04d5d · 2017-04-08T10:32:09.000-04:00
diff --git a/pandas/indexes/multi.py b/pandas/indexes/multi.py
@@ -1224,6 +1224,7 @@ def _sort_levels_monotonic(self):
             lev = lev.take(indexer)
 
             # indexer to reorder the labels
+            indexer = _ensure_int64(indexer)
             ri = lib.get_reverse_indexer(indexer, len(indexer))
             lab = algos.take_1d(ri, lab)
 
